[C:1]([O:5][C:6]([NH:8][C@@H:9]1[CH2:12][C@H:11]([C:13]([OH:15])=O)[C:10]1([CH3:17])[CH3:16])=[O:7])([CH3:4])([CH3:3])[CH3:2].C1C=CC2N(O)N=NC=2C=1.[NH:28]1[CH2:33][CH2:32][O:31][CH2:30][CH2:29]1.CCN(CC)CC>C(Cl)Cl>[CH3:16][C:10]1([CH3:17])[C@@H:11]([C:13]([N:28]2[CH2:33][CH2:32][O:31][CH2:30][CH2:29]2)=[O:15])[CH2:12][C@H:9]1[NH:8][C:6](=[O:7])[O:5][C:1]([CH3:2])([CH3:3])[CH3:4]
To a stirred solution of (1S,3R)-3-(tert-butoxycarbonylamino)-2,2-dimethylcyclobutanecarboxylic acid (Intermediate 1-Step 3, 0.3 g, 1.23 mmol) in DCM (5 ml) EDCI (0.237 g, 1.23 mmol) and HOBt (0.167 g, 1.23 mmol) were added at about 0° C., after 10 minutes morpholine (0.2 ml, 2.469 mmol) and Et3N (0.9 ml, 6.2 mmol) were added drop wise and the reaction mixture was stirred at room temperature for about 16 hours. After completion of the reaction (monitored by TLC), the reaction mixture was diluted with DCM and washed with water, saturated NaHCO3 solution, water, 1N HCl, water and saturated brine and the organic layer was concentrated under reduced pressure, the resulting crude purified by a silica gel column (100-200 mesh, elution 90% EtOAC in hexane) to afford the title compound as a syrup. Wt: 0.205 g; Yield: 53.1%; 1H NMR (300 MHz, CDCl3): δ 4.75 (d, 1H, J=8.4 Hz), 3.90-3.40 (m, 8H), 2.83-2.74 (m, 1H), 2.40-2.21 (m, 2H), 1.43 (s, 9H), 1.32 (s, 3H), 0.89 (s, 3H).
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